Recent content by uberclay

Sorry - I copied it over wrong. The 1.989E-25 is (h * c), where h = 6.63E-34, so it should read Ek = [(h * c) / λ] - W = [1.989*10^-25 / 6.30*10^-7] - W Ek = 3.16*10^-19 - (1.5 * 1.60*10^-19) = 3.16*10^-19 - 2.4*10^-19 Ek = 0.76*10^-19 Joules Thank you for your assistance.

So the e in the equation above is not for the conversion of joules to electron volts, but the elementary charge? And are my calculations correct?

Homework Statement Light with a wavelength of 630 nm is directed at a metallic surface that has a work function of 1.5 eV. Find a) the maximum kinetic energy of the emitted electrons b) the cutoff potential required to stop the photoelectrons Homework Equations Ek = [(h * c) / λ] -...